| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.82/5 | 4.38/5 |
| Vol 3-4 | 2.83/5 | 4.25/5 |
| Vol 5-6 | 2.89/5 | 4.27/5 |
| Vol 7-8 | 3.27/5 | 4.30/5 |
| Vol 9-10 | 3.77/5 | 4.35/5 |
| Vol 11-12 | 3.85/5 | 4.39/5 |
| Vol 13-14 | 3.85/5 | 4.39/5 |
| Vol 15-16 | 3.68/5 | 4.41/5 |
| Vol 17-18 | 3.82/5 | 4.38/5 |
| Vol 19-20 | 3.87/5 | 4.42/5 |
| Vol 21-22 | 3.90/5 | 4.42/5 |
| Vol 23-24 | 3.68/5 | 4.36/5 |
| Vol 25-26 | 3.86/5 | 4.38/5 |
| Vol 27 | 3.75/5 | 4.33/5 |
| Overall | 3.61/5 | 4.42/5 |